Perhaps our most important finding concerns the explanation of the existence of the bound states in the general 1D class-A model,
which are present in a half of its parameter space.
This in itself quite remarkable result has previously been obtained [1]}, [2]}, [3]}, [4]}, [5]}, but remained unexplained.
Since the model describes a topologically trivial class, naively,
one could be tempted to regard these bound states as accidental, with no particular reason for their existence.
